Sometimes it is better that it takes time for crystals to appear.
Remember that crystallisation is a purification procedure. A way to
decrease the speed of crystallisation is to use Dunlop's and Haze's drop
dilution method (K. V. Dunlop & B. Hazes (2003). When less is more: a
more efficient vapour-diffusion protocol. Acta Cryst. D59, 1797-1800).
HTH,
Fred.
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